长期以来学者们对英语中的情态动词进行着不断深入的研究，试图找出它们的共性，构建一个统一的模式对其意义和用法进行归纳和概括。
Scholars have been making a deep study of the English modals in an attempt to find out their common qualities and establish a model to sum up and generalize their meanings.
长期以来学者们对英语中的情态动词进行着不断深入的研究，试图找出它们的共性，构建一个统一的模式对其意义和用法进行归纳和概括。
Scholars have been making a deep study of the English modals in an attempt to find out their common qualities and establish a model to sum up and generalize their meanings.
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